Concrete block masonry which is also called concrete masonry unit (CMU) have advantages over brick and stone masonry.

Concrete blocks are designed in required shape and sizes and these could be solid or hollow blocks.

The common height and width of concrete blocks is 39cm x 19cm x (30cm or 20 cm or 10cm) or 2 inch, 4 inch, 6 inch, 8 inch, 10 ” and 12-inch unit configurations.

Cement, aggregate, water is used to arrange concrete blocks.

The cement-aggregate ratio in concrete blocks is 1:6. Aggregate used is of 60% fine aggregate and 40% coarse aggregate.

Their Minimum strength is all about 3N/mm2. ASTM C-90-91 specifies the compressive strength requirements of concrete masonry units.

Types of Concrete Blocks or Concrete Masonry Units

Based on the framework, shape, size and manufacturing processes concrete blocks are mainly classified into 2 types plus they are:

Solid concrete blocks

Hollow concrete Blocks

Solid Concrete Blocks

Solid concrete blocks are commonly used, which can be heavy in weight and constructed from dense aggregate. They are very good and provides good stability towards the structures. So for big work of masonry like for load bearing walls these solid blocks are preferable. They come in large sizes in comparison with bricks. So, it takes a shorter period to develop concrete masonry than brick masonry.

Hollow Concrete Blocks

Hollow concrete blocks contains void area more than 25% of gross area. Solid division of hollow bricks ought to be a lot more than 50%. The hollow part could be split into several components based on our requirement. They’re manufactured from lightweight aggregates. They’re transportable blocks and straightforward to put in.

Types of Hollow Concrete Blocks:

Stretcher block

Corner block

Pillar block

Jamb block

Partition block

Lintel block

Frogged brick block

Bullnose block

Concrete Stretcher Blocks

Corner blocks are used on the ends or corners of masonry. The ends could possibly be window or door openings etc. these are arranged in a manner that their plane end visible external as well as other end is locked using the stretcher block.

Concrete Corner Blocks

Corner blocks are used with the ends or corners of masonry. The ends may be door or window openings etc. they may be arranged in a fashion that their plane end visible to the outside and other end is locked with the stretcher block.

Concrete Pillar Blocks

Pillar block is also called as double corner block. Generally these are generally used when two ends with the corner are visible. In the event of piers or pillars these blocks are popular.

Jamb Concrete Blocks

Jamb blocks are utilized should there be an elaborated window opening from the wall. They are attached to stretcher and corner blocks. To the provision of double hung windows, jamb blocks have become beneficial to provide space for that casing people in window.

Partition Concrete Block

Partition concrete blocks are usually accustomed to build partition walls. Partition blocks have larger height than its breadth. Hollow part is divided into 2 to 3 components in the case of partition blocks.

Lintel Blocks

Lintel block or beam block is used with regards to provision of beam or lintel beam. Lintel beam is mostly provided on top portion of windows and doors, which bears the strain coming from top. Concrete lintel blocks have deep groove over the duration of block as shown in figure. After placing the blocks, this groove is loaded with concrete in addition to reinforcement.

Frogged Brick Blocks

Frogged brick block posesses a frog on its top as well as header and stretcher like frogged brick. This frog will helps the block to keep mortar also to get the strong bond with top laying block.

Bullnose Concrete Block

Bullnose blocks are like corner blocks. Their duties also same however when we’d like rounded edges at corner bullnose bricks are preferred.

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